Chapter 10: Q70 E (page 591)
Classify each substance in the table as either a metallic, ionic, molecular, or covalent network solid
X is metallic, Y is covalent and Z is ionic solids.
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Although steel is denser than water, a steel needle or paper clip placed carefully lengthwise on the surface of still water can be made to float. Explain at a molecular level how this is possible:
The molecular mass of butanol,\({C_4}{H_9}OH\), is\(74.14\); that of ethylene glycol, \({\rm{C}}{{\rm{H}}_{\rm{2}}}\left( {{\rm{OH}}} \right){\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{OH}}\), is 62.08, yet their boiling points are \({\bf{117}}.{\bf{2}}{\rm{ }}^\circ {\bf{C}}\) and \(174 ^\circ C,\)respectively. Explain the reason for the difference.
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?
The melting point of H2O(s) is \({\rm{0}}\)°C. Would you expect the melting point of H2S(s) to be \({\rm{ - 8}}{{\rm{5}}^{\rm{^\circ }}}\)C, \({{\rm{0}}^{\rm{^\circ }}}\)C, or \({\rm{ - 18}}{{\rm{5}}^{\rm{o}}}\)C? Explain your answer.
What is the evidence that all neutral atoms and molecules exert attractive forces on each other?
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